The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 25, 2026
Filed:
Oct. 28, 2022
Kabushiki Kaisha Toshiba, Tokyo, JP;
Shinji Saito, Yokohama Kanagawa, JP;
Rei Hashimoto, Edogawa Tokyo, JP;
Kei Kaneko, Yokohama Kanagawa, JP;
Tsutomu Kakuno, Fujisawa Kanagawa, JP;
KABUSHIKI KAISHA TOSHIBA, Kawasaki Kanagawa, JP;
Abstract
A quantum cascade element includes a first substrate, a quantum cascade layer and a second substrate. The quantum cascade layer is provided at a front surface side of the first substrate. The quantum cascade layer includes a plurality of quantum well layers and a plurality of barrier layers alternately stacked in a direction perpendicular to the front surface of the first substrate. The second substrate is bonded to the first substrate with the quantum cascade layer interposed. The second substrate includes a photonic crystal contacting the quantum cascade layer. The photonic crystal includes a plurality of recesses at a side contacting the quantum cascade layer. The plurality of recesses faces an uppermost layer of the plurality of barrier layers.